In the red or orange part you can see that there are many switches connected to the ATmega328p. The SDA pin of the display is connected to A4, while SCL is connected to A5 of the Arduino. If you choose this option, there is no need for a voltage regulator and the yellow part is therefore omitted. So you can replace the gray part with an Arduino Uno without any problems. The gray area contains the heart of the circuit: the ATmega328p, which acts like an Arduino Uno with the help of the surrounding components (capacitor, crystal, resistors). The colored areas on the picture are chosen in the same color as the boards on the cover picture. This step is about the circuit, how it is built and how I broke it down modularly.
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